Broad temperature plateau for high ZTs in heavily doped p-type SnSe single crystals

Peng, Kunling; Lu, Xu; Zhan, Huichun; Hui, Si; Tang, Xiaodan; Wang, Guoyu; Dai, Jiyan; Uher, Ctirad; Zhou, Xiaoyuan

doi:10.1039/c5ee03366g

Cited by 421 publications

(351 citation statements)

References 37 publications

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“…[80] According to solid state physical principles, the ZT value for bulk mate rials with a single parabolic band (SPB) along a certain direc tion can be given as: [4] The timeline for thermoelectric bulk materials with 2D structures, showing data from a superlattice, [8] SnSe, [11,[19][20][21] Bi 2 Te 3 , [12,14,16,17,[22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41] BiCuSeO, [12,[42][43][44][45][46][47][48][49][50][51][52][53][54][55][56] Na x CoO 2 , [57,58] Ca 3 Co 4 O 9 , [5...…”

Section: Strategies From Artificial Superlatticesmentioning

confidence: 99%

“…[106] As the scattering function S(Q,E) is a four dimensional physical quantity, the planar figure can be derived by slicing along the selected wave vector (Q) direction. [21] and calculated Pisarenko plot by the SPB and multiband models. c) ARPES constant energy map at E F and a binding energy of 0.4 eV, in which the in-plane Brillouin zone and high symmetry momenta are marked.…”

Section: Wwwadvmatde Wwwadvancedsciencenewscommentioning

confidence: 99%

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Promising Thermoelectric Bulk Materials with 2D Structures

2017

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Given that more than two thirds of all energy is lost, mostly as waste heat, in utilization processes worldwide, thermoelectric materials, which can directly convert waste heat to electricity, provide an alternative option for optimizing energy utilization processes. After the prediction that superlattices may show high thermoelectric performance, various methods based on quantum effects and superlattice theory have been adopted to analyze bulk materials, leading to the rapid development of thermoelectric materials. Bulk materials with two‐dimensional (2D) structures show outstanding properties, and their high performance originates from both their low thermal conductivity and high Seebeck coefficient due to their strong anisotropic features. Here, the advantages of superlattices for enhancing the thermoelectric performance, the transport mechanism in bulk materials with 2D structures, and optimization methods are discussed. The phenomenological transport mechanism in these materials indicates that thermal conductivities are reduced in 2D materials with intrinsically short mean free paths. Recent progress in the transport mechanisms of Bi2Te3‐, SnSe‐, and BiCuSeO‐based systems is summarized. Finally, possible research directions to enhance the thermoelectric performance of bulk materials with 2D structures are briefly considered.

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Section: Strategies From Artificial Superlatticesmentioning

confidence: 99%

Section: Wwwadvmatde Wwwadvancedsciencenewscommentioning

confidence: 99%

Promising Thermoelectric Bulk Materials with 2D Structures

2017

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“…[6][7][8][9][10] Recently, the IV-VI compound SnSe has received considerable attention because of its ultrahigh thermoelectric performance in both undoped and p-type-doped single crystals (SCs). [11][12][13] SnSe has a layered structure (with a Pnma space group, #62 at room temperature) and strong anisotropic properties. The a axis possesses an ultralow thermal conductivity but low ZTs.…”

Section: Introductionmentioning

confidence: 99%

Texturing degree boosts thermoelectric performance of silver-doped polycrystalline SnSe

Wang

Liu

et al. 2017

NPG Asia Mater

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Tin selenite (SnSe) has attracted significant attention due to its record thermoelectric figure of merit (ZT = 2.6 at 923 K) of its single crystal. However, the polycrystalline SnSe processes considerably less ZTs (⩽1.1). In this study, we investigate the thermoelectric properties of Ag-doped polycrystalline SnSe, which was synthesized via zone melting and hot pressing. By comparing our results and previous reports of Ag-doped single crystals and polycrystals, we determine that the high texturing degree is essential for achieving good thermoelectric performance in polycrystalline SnSe. The zone-melted Sn 0.99 Ag 0.02 Se shows better thermoelectric performance than the Ag-doped SnSe single crystal in the entire temperature range, exhibiting a peak ZT of 1.3 at 793 K.

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“…Recently, new high-performance thermoelectric materials with anisotropic-layered crystal structures, such as BiCuSeO, 27 SnSe, 28,29 31 were shown to possess low lattice thermal conductivities that resulted from their weak chemical bonds and bond anharmonicity. Earlier in 1992, Hicks and Dresselhaus 32 pointed out that a reduced dimensionality might have a vital role in reducing the thermal conductivity.…”

Section: Introductionmentioning

confidence: 99%

Intrinsically low thermal conductivity from a quasi-one-dimensional crystal structure and enhanced electrical conductivity network via Pb doping in SbCrSe3

et al. 2017

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The development of new routes for the production of thermoelectric materials with low-cost and high-performance characteristics has been one of the long-term strategies for saving and harvesting thermal energy. Herein, we report a new approach for improving thermoelectric properties by employing the intrinsically low thermal conductivity of a quasi-one-dimensional (quasi-1D) crystal structure and optimizing the power factor with aliovalent ion doping. As an example, we demonstrated that SbCrSe 3 , in which two parallel chains of CrSe 6 octahedra are linked by antimony atoms, possesses a quasi-1D property that resulted in an ultra-low thermal conductivity of 0.56 W m − 1 K − 1 at 900 K. After maximizing the power factor by Pb doping, the peak ZT value of the optimized Pb-doped sample reached 0.46 at 900 K, which is an enhancement of 24 times that of the parent SbCrSe 3 structure. The mechanisms that lead to low thermal conductivity derive from anharmonic phonons with the presence of the lone-pair electrons of Sb atoms and weak bonds between the CrSe 6 double chains. These results shed new light on the design of new and high-performance thermoelectric materials.

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Broad temperature plateau for high ZTs in heavily doped p-type SnSe single crystals

Abstract: The increased number of carrier pockets near the Fermi level and the optimized carrier concentration in doped SnSe single crystal can lead to a high averageZTave∼ 1.2 from 300 K to 800 K and a peakZTmaxvalue in excess of 2.0 at 800 K along the crystallographicb-axis.

Cited by 421 publications

References 37 publications

Promising Thermoelectric Bulk Materials with 2D Structures

Promising Thermoelectric Bulk Materials with 2D Structures

Texturing degree boosts thermoelectric performance of silver-doped polycrystalline SnSe

Intrinsically low thermal conductivity from a quasi-one-dimensional crystal structure and enhanced electrical conductivity network via Pb doping in SbCrSe3

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